Improvement in hydraulic motors



W. 0. WAKEFIELD. Hydraulic-Motors.

Patented 0ct.13,1874.

k l I "if THE GRAPHIC c0. PHUTO'LITH-ifik I PARK PLAOI, NlY.

UNITED STATES PATENT OFFICE.

WILLIAM O. WAKEFIELD, OF BOSTON, ASSIGNOR OF FOUR-FIFTHS HIS RIGHT TOCHARLOTTE MORGAN, OF MELROSE, MASSACHUSETTS.

IMPROVEMENT IN HYDRAULIC MOTORS.

Specification forming part of Letters Patent No. 156,008, dated October13, 1874; application filed September 18, 1874.

To all whom it may concern:

Be it known that I, WILLIAM O. WAKE- FIELD, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain Improvementsin Hydraulic Motors and I do hereby declare that the following, taken inconnection with the drawings which accompany and form part of thisspecification, is a description of my invention sufficient to enablethose skilled in the art to practice it.

My improvements relate to hydraulic motors and consist, primarily, in apeculiar construction of the valve; also, in affixing to a yoke on thevalve-stem an arm or guide-finger operating, in conjunction with fixedstops on the body of the case, to guide and limit the movements of thevalve in a special construction of the valve-head; in a specialconstruction of a shifting cam-ring; and in other details hereinafterset forth.

Figures 1 and 2 are elevations, showing the apparatus in two positions.Fig. 3 is a perspective of the valve and part of the valvestem; and Fig.4 is an elevation of the valvehead, with the cam-ring shown in section.

A is the body of the valve, provided with an inlet, a, long ports I) c,and an outlet (not necessary to be shown) in one of its heads, andcommunicating with one of the openings or quadrant-chambers e in thevalve for the final discharge of the water from the machine, d d beingother quadrant-chambers in the valve. These chambers are formed byaffixing to the valve-stem four similar radial wings or webs, dividingthe circle into four equal parts, the chambers d d being directlyopposite each other and capped at one end, as seen at f f, and thechambers a being directly opposite each other and capped at the otherend, as seen at g g. The head is formed with a rim, h, to fit tightly onthe body A, with a bed or base, i, to receive the pressure of thecam-ring, with a concentric raised part, j, to receive and serve as abearing and guide for the rotary reciprocations of the cam-ring la, andwith a part, 1, adapted in shape to receive a wrench. The shiftingcam-ring 7a fits snugly on the base or bed 1 and to the circular part j,and has two similar and opposite cams or double inclines, m. To theouter end of the valve-stem is socured the yoke 02, on each branch ofwhich is preferably a friction-roller, and one of these branches has aprojecting arm or guide-finger, 0, Whose movements are guided andrestrained by the guide-pins p p on the body A.

The water enters at the inlet a in the side of the body, creating anequal pressure on each side of the valve and forcing it downward,bringing the yoke 12. down onto the shiftingring it. One of the longports-say, bin the valve-body will be in communication with one of thechambers, cl, in the valve which coinmunicates with theinduction-passage a. The other of the long ports will be incommunication with one of the other chambers, e, in the valve whichcommunicates with the opening or outlet in the valve-head for the finaldischarge of the water. The water passing in at a takes its coursethrough the valve-chamber and through one of the long openings b or 0into the main body of the machine or engine, (not here represented,)thus causing the motor to make one stroke.

At or just before the termination of the stroke the shifting-ring k ispartially rotated by any appropriate connection (eccentric rod orotherwise) with the main piston of the engine, causing the projectionsor cams m m to pass under the friction-rolls or equivalent parts of theyoke, thus forcing the yoke outwardand and carrying the valve with it,the guide-pin, against which the guide-finger o is then in contact,compelling the valve to move in a right line and keep the long portopen. 4

When the valve has reached its outermost point it returns, partiallyrotating at the same time, this partial rotation being caused by theinclines or cams m m. This causes the rela tive position of the ports inthe valve-body and the openings in the valve to be exactly reversed,which will reverse the action of the piston of the motor or main engineand this piston (through its connections) will thus move theshifting-ring in a direction the opposite of its former motion, and thiswill again reverse the position of the valve.

The exhaust water passes from the valvechambers 0 out through an outlet(not shown) in the center of head q.

I claim- 1. The valve, constructed with two equal and opposite radialquadrant-chambers, 0', closed at one end only, and with other twosimilar chambers, 01 d, closed at the opposite ends, substantially asand for the purpose described.

2. The guide-finger o'on the yoke or valve- 1 stem, in combination withthe guide-pins or stops 10 p on the valve-body, substantially as and forthe purpose set forth.

